Improvement in dental pluggers



UNITED STATEs PATENT OFFICE.

JONATHAN w. BAXTER., or vEvAY, INDIANA.

IMPROVEMENT IN DENTAL PLUGGERS.

Specification forming part of Letters Patent No. 158,888, dated January19, 1875; application filed November 14, 1874.

To all whom it may concern:

Be it known that I, JONATHAN W. BAX- TER, of Vevay, Switzerland county,Indiana, have invented certain new and useful Improvements in ToothFilling and Plugging Devices, of which the following is a specification:

My invention relates to that class of toothpluggers in which the tool isoperated by a spring-hammer actuated by the ingers of the operator andconsists, rst, of a certain combination of devices for operating thehammer, by which the operator is enabled to vary the power ofthe blowwithout stopping to readjust the propelling devices; second, inconnection with the devices for compressing the spring of the hammer, ofpeculiarly-connected coiled springs, for restoring the Enger-presser andits rod to its normal position after a blow, and preserving contact ofthe rod with the hammer.

Figure 1 is a perspective view of a plugger in the hand of an operatorembodying my invention. Fig. 2 is a longitudinal section of the plugger,with the finger-presser partly drawn back, and in position to compressthe hammer for a moderate blow. Fig. 3 is a perspective View of4Enger-presser and aXis with pressing-surface removed.

A is the case of a tooth-plugging point, B, of any desiredconfiguration. The butt end of the point is screwed into a socket, C,with an enlarged head, c, fitted to move longitudinally inside of thecase, and retained in either of two directions by projections a, a onthe case A, and a notch cut across the head o.

This notch and projections, which can be rei versed, so as to have theprojections on the head c and the notches in the case, permit the toolto be turned half-way round at any time while in operation. The head andits point B have sufficient longitudinal play in the case to enable thepoint to enter the work after the blow is struck, and the spring Dserves to keep the point-head up in the case until the blow is struck. Aremovable pin, E, in the head o, receives the blow. The slot in the'upper surface of head. c, when in proper position, drops around theprojections a a', and is retained there by spring D until, by insertinga small rod into a hole, p, in point B, the operator draws it forward,and revolves it to the opposite position. The hammer or plunger F iscircular, fitting the case A accurately, and ithas, from its lower orstriking end some distance up, a ratchet-surface, the greatest pitch ofwhose teeth are toward the striking end. The other end is decreased indiameter, and f1tting over it, and resting between the shoulder f andcap a of case A, I provide a spiral spring, H, which furnishes thepropelling power to the hammer or plunger F. To provide for thehammer-operating device, I secure to the outside of case A, in positionshown, standards I I', which uphold the axis of nger 'lever or presserJ, and, in order to give the said presser an upward tendency, I place aspiral spring, K, around its axle and under the lever, with bearings lokon the standards I I. rIhe body ofthe presser J, upon which is securedpresser-plate j, is separated into two arms, which embrace and hold attheir farthest end the rod L, to preserve a downward tendency, to whichI provide a coilspring, M, similar to spring K.

In operation,the linger, pressing against finger-presser J, forces itover the arc of a circle, carrying with it the rod L, which rests in theteeth ofthe plunger, through slot a!" of case A, and, consequently, alsoforces the latter, until the project-ions l Z of said rod meet theupward incline a/"f ofthe case A, and are thereby disengaged from theplunger F, which being thus released, darts against the pin E by theforce of spring H, and thus furnishes the desired blow, while theratchet L and ingerpresser J, by the force of springs K and M, return totheir former positions. By causing the ratchet to gear in differentplaces along the plunger the force of the blow is modified or varied atwill.

I claim- 1. The combination 0f ratchet-formed plunger F, relief-inclineam', rod L l l', and fingerpresser J, connected and operatingsubstantially as and for the purpose specified.

2. In combination with rod L, finger-presser J, and bearings 7c 7c onstandards I I', the springs K and M, connected and operatingsubstantially as specified.

In testimony of which invention I hereunto set my hand.

J. W. BAXTER.

Witnesses:

FRANK MILLWARD, H. M. HUNTER.

